463943-99-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 463943-99-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,6,3,9,4 and 3 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 463943-99:
(8*4)+(7*6)+(6*3)+(5*9)+(4*4)+(3*3)+(2*9)+(1*9)=189
189 % 10 = 9
So 463943-99-9 is a valid CAS Registry Number.
463943-99-9Relevant articles and documents
[5]Helicenes by iterative radical cyclisations to arenes
Harrowven, David C,Nunn, Michael I.T,Fenwick, David R
, p. 3189 - 3191 (2002)
The paper describes a synthesis of 1,2,3,12,13,14-hexamethoxy[5]helicene 1. The synthesis features two sp2-sp2 bond forming reactions, each involving a 6-exo/endo-trig cyclisation of an aryl radical intermediate to an arene.